digiKam 
digiKam is an advanced and powerful photo manager which is mainly used for organizing and editing software, developed for Linux users. However, later it was adapted to Windows and Mac operating systems too. This digital photo management application is built for KDE which helps import and 
organize digital photos quickly. It is a comprehensive package that allows users to import images from various sources, organize them into albums, and use them later for any application. The organized folder lets users search or browse through their collection based on location, time, tags, faces, and more. It lets the user retouch photos in a full-strength editor as well. It doesn't pose restrictions on the user to export only to a selective place as the edited images can be shared via online hosts. 
 
Why you must get it?
The feature which distinguishes digiKam from other photo editing apps is its depth searching feature. It lets users search by various names and tags helping them find the exact image. It even supports RAW image processing and extends its support to over 1200 digital camera models.